<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
   - http://creativecommons.org/publicdomain/zero/1.0/ -->

<html>
  <style>
  body {
    width: 400px;
  }
  div#float {
    float: right;
    width: 200px;
    height: 200px;
    background-color: lightgreen;
  }
  div#details {
    float: right;
    background-color: orange;
  }
  div#summary {
    background-color: green;
  }
  </style>
  <body>
    <div id="float"></div>
    <div id="details">
      <div id="summary">Summary</div>
      <!-- No content due to closed details -->
    </div>
  </body>
</html>
